The Physics of Dust Coagulation and the Structure of Dust Aggregates in Space

摘要: Even though dust coagulation is a very important dust-processing mechanism in interstellar space and protoplanetary disks, there are still parts of the physics involved that poorly understood. This imposes serious problem for model calculations any kind. In this paper, we attempt to improve situation by including effects tangential forces on contact some detail. These have been studied recent papers. We summarize main results from these papers apply them detailed simulations process collisions between aggregates. Our show following: (1) growth aggregates monomers will normally not involve major restructuring aggregates, (2) classical hit-and-stick assumption reasonably valid case, (3) with each other or large grains can lead significant compaction, (4) be easily understood terms critical energies different processes. also derive short summary may used as recipe determining outcome calculations. It shown turbulent velocity fields clouds capable producing considerably compressed while small forming early solar nebula compacted collisions. However, compaction provides an energy sink larger nebula.